package c2;

//JSplashWindow.java
//Demos how to show a splash window

import javax.swing.*;
import java.awt.*;
import java.net.*;

public class JSplashWindow extends JWindow implements Runnable {
    Thread splashThread = null;

    public JSplashWindow() {
        setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
        JPanel splash = new JPanel(new BorderLayout());
        URL url = getClass().getResource("images/winter.jpg");//错误在这变成/images/winter.jpg也不对
//我想执行这句

        if (url != null) {
            splash.add(new JLabel(new ImageIcon(url)), BorderLayout.CENTER);
        }
//这句是测试url有没有被赋值的  被执行了。。。
        if(url==null)
        {
            splash.add(new JLabel("helloworld"));
        }
        
        setContentPane(splash);

        Dimension screen = getToolkit().getScreenSize();
        pack();
        setLocation((screen.width - getSize().width) / 2,
                (screen.height - getSize().height) / 2);
    }

    public void start() {
        this.toFront();
        splashThread = new Thread(this);
        splashThread.start();

    }

    public void run() {
        try {
            show();
            Thread.sleep(5000);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        this.dispose();
    }

    static void showFrame(String title) {
        JFrame frame = new JFrame(title);
        frame.setSize(400, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        // Center the window
        Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
        Dimension frameSize = frame.getSize();
        if (frameSize.height > screenSize.height) {
            frameSize.height = screenSize.height;
        }
        if (frameSize.width > screenSize.width) {
            frameSize.width = screenSize.width;
        }
        frame.setLocation((screenSize.width - frameSize.width) / 2,
                (screenSize.height - frameSize.height) / 2);

        frame.setVisible(true);

    }

    public static void main(String[] args) {
        showFrame("Demo splash window");
        JSplashWindow splash = new JSplashWindow();
        splash.start();

    }
}